Struct KineticSampler 

pub struct KineticSampler { /* private fields */ }

Release-velocity estimator for continuous (pixel) scrolling.

Touchpads and touchscreens report a gesture as PixelDelta wheel events bracketed by winit::event::TouchPhases. Feed every delta the view actually consumed to Self::record; on Ended, Self::release returns the average content-space velocity over the last 100 ms, so a finger that paused before lifting does not fling.

Implementations

impl KineticSampler

pub fn new() -> KineticSampler

pub fn record(&mut self, dx: f64, dy: f64, now: Instant)

Record one consumed content-space delta.

pub fn reset(&mut self)

Forget the gesture, e.g. when the view stopped consuming it.

pub fn release(&mut self, now: Instant) -> Option<(f64, f64)>

End the gesture and return its content-space velocity in logical pixels per second, or None when the fingers had come to rest.

Trait Implementations

impl Clone for KineticSampler

fn clone(&self) -> KineticSampler

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for KineticSampler

fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter.

impl Default for KineticSampler

fn default() -> KineticSampler

Returns the “default value” for a type.